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annotate src/thread/dc/SDL_sysmutex.c @ 789:f9d0e03fc2ff

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Date: Wed, 28 Jan 2004 02:37:04 +0100 From: Max Horn Subject: Small libtool patch (framework related) here is a small patch for ltmain.sh. It corrects a problems with the libSDL.la file, which prevented applications using a version of libtool w/o framework support (read: all currently released libtool version) to not being able to link with SDL anymore. I also notified the libtool maintainers, as the same problem exists in libtool CVS.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 28 Jan 2004 01:57:34 +0000
parents b8d311d90021
children c9b51268668f
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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b8d311d90021 Updated copyright information for 2004 (Happy New Year!)
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3 Copyright (C) 1997-2004 Sam Lantinga
509
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 BERO
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20 bero@geocities.co.jp
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21
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22 based on generic/SDL_sysmutex.c
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23
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24 Sam Lantinga
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25 slouken@libsdl.org
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26 */
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27
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28 #ifdef SAVE_RCSID
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29 static char rcsid =
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30 "@(#) $Id$";
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31 #endif
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32
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33 /* An implementation of mutexes using semaphores */
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34
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35 #include <stdio.h>
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36 #include <stdlib.h>
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37
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38 #include "SDL_error.h"
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39 #include "SDL_thread.h"
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40 #include "SDL_systhread_c.h"
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41
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42 #include <arch/spinlock.h>
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43
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44 struct SDL_mutex {
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45 int recursive;
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46 Uint32 owner;
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47 spinlock_t mutex;
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48 };
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49
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50 /* Create a mutex */
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51 SDL_mutex *SDL_CreateMutex(void)
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52 {
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53 SDL_mutex *mutex;
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54
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55 /* Allocate mutex memory */
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56 mutex = (SDL_mutex *)malloc(sizeof(*mutex));
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57 if ( mutex ) {
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58 spinlock_init(&mutex->mutex);
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59 mutex->recursive = 0;
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60 mutex->owner = 0;
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61 } else {
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62 SDL_OutOfMemory();
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63 }
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64 return mutex;
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65 }
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66
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67 /* Free the mutex */
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68 void SDL_DestroyMutex(SDL_mutex *mutex)
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69 {
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70 if ( mutex ) {
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71 free(mutex);
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72 }
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73 }
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74
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75 /* Lock the semaphore */
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76 int SDL_mutexP(SDL_mutex *mutex)
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77 {
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78 #ifdef DISABLE_THREADS
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79 return 0;
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80 #else
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81 Uint32 this_thread;
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82
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83 if ( mutex == NULL ) {
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84 SDL_SetError("Passed a NULL mutex");
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85 return -1;
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86 }
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87
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88 this_thread = SDL_ThreadID();
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89 if ( mutex->owner == this_thread ) {
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90 ++mutex->recursive;
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91 } else {
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92 /* The order of operations is important.
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93 We set the locking thread id after we obtain the lock
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94 so unlocks from other threads will fail.
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95 */
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96 spinlock_lock(&mutex->mutex);
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97 mutex->owner = this_thread;
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98 mutex->recursive = 0;
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99 }
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100
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101 return 0;
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102 #endif /* DISABLE_THREADS */
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103 }
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104
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105 /* Unlock the mutex */
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106 int SDL_mutexV(SDL_mutex *mutex)
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107 {
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108 #ifdef DISABLE_THREADS
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109 return 0;
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110 #else
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111 if ( mutex == NULL ) {
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112 SDL_SetError("Passed a NULL mutex");
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113 return -1;
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114 }
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115
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116 /* If we don't own the mutex, we can't unlock it */
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117 if ( SDL_ThreadID() != mutex->owner ) {
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118 SDL_SetError("mutex not owned by this thread");
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119 return -1;
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120 }
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121
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122 if ( mutex->recursive ) {
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123 --mutex->recursive;
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124 } else {
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125 /* The order of operations is important.
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126 First reset the owner so another thread doesn't lock
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127 the mutex and set the ownership before we reset it,
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128 then release the lock semaphore.
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129 */
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130 mutex->owner = 0;
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131 spinlock_unlock(&mutex->mutex);
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132 }
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133 return 0;
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134 #endif /* DISABLE_THREADS */
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135 }